Question

For cadmium plating the electrolyte used is:
A. Cadmium sulphate and sulphuric acid
B. Cadmium hexametaphosphate
C. Sodium cyanide, cadmium and caustic soda
D. All of the above.

Answer 1

Hint: Electroplating is a process to coat a metal on the surface of the base metal. We have to protect the base metal from corrosion. The metal which is used to protect base metal is called coat metal. In electroplating the coat metal should be an anode and base metal should be a cathode. Both the electrodes are dipped in a salt solution of the anode called electrolyte.

Complete Solution :
- In the question it is given that the electrolyte used for cadmium plating is.
- For the process of cadmium plating we need a salt of the anode.
- The electrolyte used in cadmium plating is Sodium cyanide, a cadmium salt and an alkali compound like caustic soda.
- The amount of Sodium cyanide, cadmium and caustic soda used in cadmium plating are 30 grams, 50 grams and 20 grams respectively.
- Therefore For cadmium plating the electrolyte used is Sodium cyanide, cadmium and caustic soda.
So, the correct answer is “Option C”.

Note: Electroplating is a technique used to protect the base metal from corrosion. Electroplating is one of the methods used to control the corrosion under the name of corrosion control methods. In this method we have to connect the anode and cathode of the cell to an external source to carry out the electroplating process.